Brush-holder for dynamo-electric machines



(No Model.) v

P. E. AVERILL. BRUSH HOLDER FOR DYNAMO ELECTRIC MACHINES. No. 510,952.

Ear s INVENTOR v1.2

ATTORNEYS. I

UNITED STATES PATENT ()FFICE.

FRANK E. AVERILL, 'OF SYRACUSE, NEW YORK.

BRUSH-HOLDER FOR DYNAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 510,952, dated December 19, 1893.

Application filed February 13, 1893. Serial No. 462,069- (No model.)

To aZZ whom it may concern;

Be it known that I, FRANK E. AVERILL, of Syracuse, in the county of Onondaga, in the State of New York, have invented new and useful Improvements in Brush-Holders for Dynamo-Electric Machines, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

My invention relates to improvements in brush holders for dynamo electric machines, and has for its object the production of a simple and comparatively light device, which is cheaply manufactured, and is strong and practical in use; and to this end itconsists, essentially, in a brush holder frame loosely mounted on a supporting spindle and having one extremity adapted to support the brush, an arm fixedly mounted on the spindle and arranged between the two extremities of the holder frame, and a spring having one end connected to the arm and the other to the opposite extremity of the holder frame.

The invention furthermore consists in the detail construction and arrangement of the parts, all as hereinafter more particularly described and pointed out in the claims.

In describing this invention, reference is had to the accompanying drawings, forming a part of this specification, in which like letters indicate corresponding parts in all the views.

Figure 1 is an elevation of a pair of my improved brush holders shown as operatively mounted upon a supporting rocker arm having its lower end broken away, one of the brush holder frames being shown in elevation and the other in section. Fig. 2 is an elevation of one of the brush holders and its sup porting spindle. Fig. 3 is a longitudinal seetional view, taken on line33, Fig. 2, the brush holder frame being shown as in its position assumed when the brush is out of contact with the commutator, and Fig. 4 is asectional view, taken on line -et--4--, Fig. 3.

A is a rocker arm, and BB brush holders mounted thereon. This rocker arm may be of any desirable form, size, and construction, and is here shown as composed of a split hub --Ct, which is mounted on the usual supporting spindle (not here illustrated), and oppositely arranged arms -ct-aprovided with spindles -AA for supporting my improved brush holders. The split hub -ais secured in operative position upon its supporting spindle bya suitable clamp a provided with a screw-threaded spindle -a passed through separated ears c0ct upon said hub.

My improved brush holder consists of a brush holder frame -B- loosely mounted on the corresponding spindle --A, an arm O fixedly mounted on said spindle A and arranged between the two extremities of the holder frame, a spring --D having one end connected to the rear or outer extremity of the holder frame and the other to said arm, and a stop E* having one end movably supported upon the rear or outer end of the holder frame and the other adapted to engage the arm for holding the brush out of operative position.

The brush holder frame B is formed with a central opening, and consists of a pair of longitudinal side-bars bbhaving their adjacent faces separated and their central portions provided with openings b b'- for receiving the corresponding spindle -A' and having their front or inner extremities of greater width than their rear or outer extremities; a socket l/ of angular cross section at the front orinner end of said frame -B for receiving the brush -F; and a rear cross-bar b A suitable clamping screw b is movable in the front wall of the socket b against the adjacent side of the brush F-, and firmly holds the same in position, and the rear cross-bar b is provided with an outwardly extending arm l having a perforation -b therethrough.

The arm -O-, as best seen at Figs. 2 and 4, is interposed between the longitudinal bars bbof the holder frame B and between the opposite extremities of said holder frame, and is formed at one end with an eye -c for receiving the end of the spindle -A, and is provided with a set screw -c, the end of which enters a recess -A in the spindle -A, and fixedly secures said arm to the spindle. The opposite end of the arm is formed with a curved bearing face c provided with a transverse shoulder -c The spring -D-- is arranged at the outside of the holder frame B in front of its ICO outwardly extending arm Zfiin a vertical plane interposed between the planes of the longitudinal sides bb of said holder frame, and one end thereof is engaged with the outer end of the arm C and the other is suitably connected to the rear end of the holder frame. The connection for the rear end of the spring D- consists preferably of a spring adjuster comprising a screwthreaded bar or stud b passed through the perforation b in the arm b and having its forward end secured to the rear end of said spring, and a clamping nut b movable upon the opposite end of said stud b and bearin g against the rear face of the arm b*". By means of the nut b the tension of the spring D is readily adjusted, and, as the perforation b in the arm b is of slightly greater diameter than the screw-threaded stud b the spring :D-Btis free to adjust itself to a limited ex- It is frequently desired to hold the brush holder frame in such position that the brush is held out of operative position, and for this purpose my brush holder is provided with a stop E- having one end hinged to the rear end of the holder frame and the other movable normally along the curved face c of the arm C. A spring e having its central portion secured to the cross-bar b'- and its oppositeends wound around opposite hubs provided upon the rear end of the stop E serves to force the opposite end of said stop E- against the face c When desired to bring the stop E- into operative position the holder frame is rocked on the spindle A' in such direction that its forward end swings backwardly and draws the lower end of the brush -F-away from the commutator shown by dotted lines at Fig. 1. This movement of the holder frame continues until the forward end of the stop E engages the transverse shoulder c upon the curved face c of the arm O, whereupon the holder frame is held in this position, until the stop E- is forced from operative position by engagement with an arm -e'- thereon, whereupon the spring D- rocks the forward end of the holder frame downwardly and engages the brush --F with the commutator.

It is evident to one skilled in the art that, owing to the peculiar construction of my improved brush holder, the spring -D-= is slightly increased in length, or extended lengthwise when the brush is resting upon the commutator instead of being compressed beyond its normal condition, and that consequently, as the brush trembles in actual use, owlngto the revolution of the commutator,the springis in condition to act quickly and effectively, and is not at all liable to become set and ineffectual. Moreover, there is not the slightest liability of the premature escapeof the spring as its opposite ends are firmly secured to the arm -C and to the stud b or of the engagementwith the commutator of the rear end of the holder frame in case the arm -C becomes loose on its supporting spindle, since the weight of the holder frame is so arranged that there is no tendency of its rear end to fall forwardly into engagement with the commutator.

The operation of my invention will be readily perceived from the foregoing description and upon reference to the drawings, and it will be particularly noted that the same is simple and practical, is easily manufactured, and is durable, strong, and effective in use.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a brush holder for dynamo electric machines, the combination of a supporting spindle, a brush holder frame loosely mounted on the spindle and having one extremity adapted to support the brush, an arm fixedly mounted on the spindle and arranged between the two extremities of the holder frame, and a spring having one end connected to the arm and the other to the opposite extremity of the holder frame, substantially as and for thepurpose set forth.

2. In a brush holder for dynamo electric machines, the combination of a supporting spindle, abrush holder frame loosely mounted on the spindle and having one extremity adapted to support the brush, an arm fixedly mounted on the spindle and arranged between the two extremities of the holder frame, a spring adjuster adjustably supported on the opposite extremity of the holder frame, and a spring having oneend connected to the arm and the other to the spring adjuster, substantially as and for the purpose specified.

3. In a brush holder for a dynamo electric machine, the combination of a supporting spindle, a brush holder frame loosely mounted on the spindle and having one extremity adapted to support the brush, an arm fixedly mounted on the spindle and arranged between the two extremities of the holder.frame,said arm being formed with an engaging shoulder, a spring having one end connected to the arm and the other to the opposite extremity ofthe holder frame, and a movable stop having one end secured to said opposite extremity of the holder frame and the other adapted to engage said shoulder on the arm and to prevent the action of the spring, substantially as and for the purpose set forth.

4. In a brush holder for dynamo electric machines, the combination of a supporting spindle,a brush holder frame loosely mounted on the spindle and havingone extremity adapted tosupport the brush, an arm fixedly mounted on the spindle and arranged'between the two extremities of the holder frame, said arm being formed with an engaging shoulder, a spring adjuster adj ustably supported on the opposite extremity of the holder frame, a spring having one end connected to the arm and the other to the spring adjuster, and a IIO movable stop having one end secured to said opposite extremity of the holder frame and the other adapted to engage said shoulder on the frame and to prevent the action of said spring, substantially as and for the purpose specified.

5. In a brush holder for a dynamo electric machine, the combination of a supporting spindle, a brush holder frame loosely mounted on the spindle and having its central portion provided with an opening therethrough and having one extremity adapted to support the brush, an arm fixedly mounted in the spindle and arranged between the two extremities of the holder frame within the opening therethrough, and a spring having one end connected to the arm and the other to the opposite extremity of the holder frame, substantially as and for the purpose set forth.

6. In a brush holder fora dynamo electric machine, the combination of a supporting spindle, a brush holder frame loosely mounted on the spindle and having its central portion provided with an opening therethrough and having one extremity adapted to support the brush, the other extremity provided with an upwardly extending arm, an arm fixedly mounted on the spindle and arranged between the two extremities of the holder frame within the openingtherethrough, and a spring having one end connected to the fixedly mounted arm and the other to the upwardly extending arm on said opposite extremity of the holder frame, substantially as and for the purpose specified.

'7. In a brush holder for a dynamo electric machine, the combination of a supporting spindle, a brush holder frameloosely mounted on the spindle and having its central portion provided with an opening therethrough and having one extremity adapted to support the brush and the other extremity provided with an upwardly extending arm having a perforation therethrough, an arm fixedly mounted on .the spindle and arranged between two extremities of the holder frame within the opening therethrough, a screw-threaded adjuster stud adj ustably movable in said perforation in said arm on the extremity of the holder frame, an adjustable shoulder on said screwthreaded adjuster bar bearing against the outer face of said arm on the holder frame, and a spring having one end connected to the fixedly mounted arm and the other to the adjacent end of the adjuster bar, substantially as and for the purpose set forth.

8. In a brush holder for a dynamo electric machine, the combination of a supporting spindle, a brush holder frame loosely mounted on the spindle and having its central portion provided with an opening therethrough and having one extremity adapted to support the brush, an arm fixedly mounted on the spindle and arranged between the two extremities of the holder frame within the opening therethrough, said arm having a curved bearing face and an engaging shoulder on said bearing face, a spring having one end connected to the fixedly mounted arm and the other to said opposite extremity of the holder frame, and a stop having one end secured to said opposite extremity of the frame holder and the other movable on said face of the fixedly mounted arm for engaging the shoulder on said face, substantially as and for the purpose set forth.

In testimony whereof I have hereunto signed my name, in the presence of two attesting witnesses, at Syracuse, in the county of Onondaga, in the State of New York, this 9th day of February, 1893.

FRANK E. AVERILL.

Vitnesses:

CLARK l-I. NORTON, M. BAXTER. 

